Learning awk/sed and modify
/etc/fstab both should not be mixed. Actually
/etc/fstab is a critical file and should not be used for experiments. And even if you want, then better to be take it's backup first.
Code:
~$ awk 'BEGIN{FS=" "}; /\/dev\/group\/mine/ {gsub(/defaults/,"defaults,noauto", $4) && (/1/,"0",$5) && (/2/,"0",$6); print $0}' /etc/fstab
(Note: I didn't test it, but it can give you a rough idea).